Infrared and millimetre-wave scintillometry in the suburban environment – Part 1: Structure parameters
Scintillometry, a form of ground-based remote sensing, provides the capability to estimate surface heat fluxes over scales of a few hundred metres to kilometres. Measurements are spatial averages, making this technique particularly valuable over areas with moderate heterogeneity such as mixed agricu...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2015-03-01
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| Series: | Atmospheric Measurement Techniques |
| Online Access: | http://www.atmos-meas-tech.net/8/1385/2015/amt-8-1385-2015.pdf |
| _version_ | 1818764783293300736 |
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| author | H. C. Ward J. G. Evans C. S. B. Grimmond J. Bradford |
| author_facet | H. C. Ward J. G. Evans C. S. B. Grimmond J. Bradford |
| author_sort | H. C. Ward |
| collection | DOAJ |
| description | Scintillometry, a form of ground-based remote sensing, provides the
capability to estimate surface heat fluxes over scales of a few hundred
metres to kilometres. Measurements are spatial averages, making this
technique particularly valuable over areas with moderate heterogeneity such
as mixed agricultural or urban environments. In this study, we present the
structure parameters of temperature and humidity, which can be related to
the sensible and latent heat fluxes through similarity theory, for a
suburban area in the UK. The fluxes are provided in the second paper of this
two-part series. A millimetre-wave scintillometer was combined with an
infrared scintillometer along a 5.5 km path over northern Swindon. The
pairing of these two wavelengths offers sensitivity to both temperature and
humidity fluctuations, and the correlation between wavelengths is also used
to retrieve the path-averaged temperature–humidity correlation. Comparison
is made with structure parameters calculated from an eddy covariance station
located close to the centre of the scintillometer path. The performance of
the measurement techniques under different conditions is discussed. Similar
behaviour is seen between the two data sets at sub-daily timescales. For the
two summer-to-winter periods presented here, similar evolution is displayed
across the seasons. A higher vegetation fraction within the scintillometer
source area is consistent with the lower Bowen ratio observed (midday Bowen
ratio < 1) compared with more built-up areas around the eddy
covariance station. The energy partitioning is further explored in the
companion paper. |
| first_indexed | 2024-12-18T08:07:41Z |
| format | Article |
| id | doaj.art-6601d91b0f5e47ffb29ea48472a23cb0 |
| institution | Directory Open Access Journal |
| issn | 1867-1381 1867-8548 |
| language | English |
| last_indexed | 2024-12-18T08:07:41Z |
| publishDate | 2015-03-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Measurement Techniques |
| spelling | doaj.art-6601d91b0f5e47ffb29ea48472a23cb02022-12-21T21:14:57ZengCopernicus PublicationsAtmospheric Measurement Techniques1867-13811867-85482015-03-01831385140510.5194/amt-8-1385-2015Infrared and millimetre-wave scintillometry in the suburban environment – Part 1: Structure parametersH. C. Ward0J. G. Evans1C. S. B. Grimmond2J. Bradford3Centre for Ecology and Hydrology, Wallingford, Oxfordshire, OX10 8BB, UKCentre for Ecology and Hydrology, Wallingford, Oxfordshire, OX10 8BB, UKDepartment of Geography, King's College London, London, WC2R 2LS, UKSpace Science Department, Rutherford Appleton Laboratory, Didcot, Oxfordshire, OX11 0QX, UKScintillometry, a form of ground-based remote sensing, provides the capability to estimate surface heat fluxes over scales of a few hundred metres to kilometres. Measurements are spatial averages, making this technique particularly valuable over areas with moderate heterogeneity such as mixed agricultural or urban environments. In this study, we present the structure parameters of temperature and humidity, which can be related to the sensible and latent heat fluxes through similarity theory, for a suburban area in the UK. The fluxes are provided in the second paper of this two-part series. A millimetre-wave scintillometer was combined with an infrared scintillometer along a 5.5 km path over northern Swindon. The pairing of these two wavelengths offers sensitivity to both temperature and humidity fluctuations, and the correlation between wavelengths is also used to retrieve the path-averaged temperature–humidity correlation. Comparison is made with structure parameters calculated from an eddy covariance station located close to the centre of the scintillometer path. The performance of the measurement techniques under different conditions is discussed. Similar behaviour is seen between the two data sets at sub-daily timescales. For the two summer-to-winter periods presented here, similar evolution is displayed across the seasons. A higher vegetation fraction within the scintillometer source area is consistent with the lower Bowen ratio observed (midday Bowen ratio < 1) compared with more built-up areas around the eddy covariance station. The energy partitioning is further explored in the companion paper.http://www.atmos-meas-tech.net/8/1385/2015/amt-8-1385-2015.pdf |
| spellingShingle | H. C. Ward J. G. Evans C. S. B. Grimmond J. Bradford Infrared and millimetre-wave scintillometry in the suburban environment – Part 1: Structure parameters Atmospheric Measurement Techniques |
| title | Infrared and millimetre-wave scintillometry in the suburban environment – Part 1: Structure parameters |
| title_full | Infrared and millimetre-wave scintillometry in the suburban environment – Part 1: Structure parameters |
| title_fullStr | Infrared and millimetre-wave scintillometry in the suburban environment – Part 1: Structure parameters |
| title_full_unstemmed | Infrared and millimetre-wave scintillometry in the suburban environment – Part 1: Structure parameters |
| title_short | Infrared and millimetre-wave scintillometry in the suburban environment – Part 1: Structure parameters |
| title_sort | infrared and millimetre wave scintillometry in the suburban environment ndash part 1 structure parameters |
| url | http://www.atmos-meas-tech.net/8/1385/2015/amt-8-1385-2015.pdf |
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